[MLLib] Fix example code variable name misspelling in MLLib Feature Extraction guide
[MLLib] Fix example code variable name misspelling in MLLib Feature Extraction guide

Author: RJ Nowling <rnowling@gmail.com>

Closes #2459 from rnowling/tfidf-fix and squashes the following commits:

b370a91 [RJ Nowling] Fix variable name misspelling in MLLib Feature Extraction guide

sahilTakiar/spark,ptkool/spark,WindCanDie/spark,rednaxelafx/apache-spark,gioenn/xSpark,zuotingbing/spark,SHASHANKB/spark,tengpeng/spark,tengpeng/spark,janewangfb/spark,szhem/spark,eyalfa/spark,nlalevee/spark,huang1900/spark,nlalevee/spark,debugger87/spark,lxsmnv/spark,jianran/spark,WindCanDie/spark,nilsgrabbert/spark,taroplus/spark,cin/spark,ueshin/apache-spark,aosagie/spark,janewangfb/spark,MLnick/spark,adrian-ionescu/apache-spark,bdrillard/spark,minixalpha/spark,stanzhai/spark,rikima/spark,dbtsai/spark,SnappyDataInc/spark,sahilTakiar/spark,dhruve/spark,ioana-delaney/spark,goldmedal/spark,mahak/spark,cloud-fan/spark,dongjoon-hyun/spark,maropu/spark,wzhfy/spark,rikima/spark,haowu80s/spark,highfei2011/spark,sachintyagi22/spark,saltstar/spark,ioana-delaney/spark,ajaysaini725/spark,someorz/spark,mzl9039/spark,taroplus/spark,WeichenXu123/spark,alunarbeach/spark,1haodian/spark,mzl9039/spark,wangyum/spark,rednaxelafx/apache-spark,shaneknapp/spark,adrian-ionescu/apache-spark,kimoonkim/spark,saltstar/spark,pronix/spark,xflin/spark,zhouyejoe/spark,dongjoon-hyun/spark,mdespriee/spark,guoxiaolongzte/spark,someorz/spark,shaneknapp/spark,milliman/spark,metamx/spark,xflin/spark,srowen/spark,wangmiao1981/spark,apache-spark-on-k8s/spark,UndeadBaneGitHub/spark,ibm-research-ireland/sparkoscope,saltstar/spark,JerryLead/spark,guoxiaolongzte/spark,pgandhi999/spark,panfengfeng/spark,vinodkc/spark,ueshin/apache-spark,UndeadBaneGitHub/spark,1haodian/spark,nilsgrabbert/spark,apache/spark,poffuomo/spark,publicRoman/spark,nchammas/spark,ahnqirage/spark,sureshthalamati/spark,setjet/spark,poffuomo/spark,lvdongr/spark,aray/spark,kiszk/spark,zhouyejoe/spark,kiszk/spark,tengpeng/spark,gengliangwang/spark,lvdongr/spark,brad-kaiser/spark,wzhfy/spark,chuckchen/spark,sureshthalamati/spark,ericvandenbergfb/spark,sahilTakiar/spark,xflin/spark,gengliangwang/spark,rezasafi/spark,bOOm-X/spark,ptkool/spark,saturday-shi/spark,darionyaphet/spark,liyichao/spark,loneknightpy/spark,dongjoon-hyun/spark,tejasapatil/spark,ajaysaini725/spark,ahnqirage/spark,mike0sv/spark,ahnqirage/spark,holdenk/spark,apache-spark-on-k8s/spark,ron8hu/spark,rikima/spark,ptkool/spark,kissmetrics/spark,rikima/spark,darionyaphet/spark,WindCanDie/spark,caneGuy/spark,icexelloss/spark,rezasafi/spark,mike0sv/spark,yanboliang/spark,holdenk/spark,goldmedal/spark,dongjoon-hyun/spark,janewangfb/spark,rekhajoshm/spark,minixalpha/spark,techaddict/spark,map222/spark,srowen/spark,guoxiaolongzte/spark,liyichao/spark,maropu/spark,stanzhai/spark,mdespriee/spark,hhbyyh/spark,SHASHANKB/spark,goldmedal/spark,darionyaphet/spark,panfengfeng/spark,ajaysaini725/spark,matthewfranglen/spark,goldmedal/spark,witgo/spark,jianran/spark,kevinyu98/spark,icexelloss/spark,panfengfeng/spark,actuaryzhang/spark,ron8hu/spark,wangyum/spark,yanboliang/spark,caneGuy/spark,andrewor14/iolap,haowu80s/spark,sachintyagi22/spark,Panos-Bletsos/spark-cost-model-optimizer,witgo/spark,map222/spark,witgo/spark,BryanCutler/spark,SHASHANKB/spark,ConeyLiu/spark,ibm-research-ireland/sparkoscope,sahilTakiar/spark,actuaryzhang/spark,gengliangwang/spark,BryanCutler/spark,JerryLead/spark,kimoonkim/spark,apache-spark-on-k8s/spark,hvanhovell/spark,ahnqirage/spark,markhamstra/spark,JoshRosen/spark,maropu/spark,wangmiao1981/spark,shubhamchopra/spark,spark-test/spark,bdrillard/spark,SnappyDataInc/spark,shubhamchopra/spark,bdrillard/spark,andrewor14/spark,kevinyu98/spark,huang1900/spark,ioana-delaney/spark,jlopezmalla/spark,kiszk/spark,shuangshuangwang/spark,markhamstra/spark,yanboliang/spark,kissmetrics/spark,bOOm-X/spark,gioenn/xSpark,Panos-Bletsos/spark-cost-model-optimizer,saltstar/spark,narahari92/spark,michalsenkyr/spark,vinodkc/spark,sureshthalamati/spark,dbtsai/spark,BryanCutler/spark,debugger87/spark,goldmedal/spark,markhamstra/spark,cin/spark,gioenn/xSpark,rezasafi/spark,zero323/spark,nlalevee/spark,jrshust/spark,gioenn/xSpark,michalsenkyr/spark,aosagie/spark,mahak/spark,zzcclp/spark,cloud-fan/spark,publicRoman/spark,BryanCutler/spark,ddna1021/spark,mike0sv/spark,sachintyagi22/spark,szhem/spark,caneGuy/spark,mdespriee/spark,setjet/spark,zuotingbing/spark,bravo-zhang/spark,witgo/spark,kiszk/spark,publicRoman/spark,LantaoJin/spark,kiszk/spark,apache/spark,stanzhai/spark,mdespriee/spark,eyalfa/spark,loneknightpy/spark,wangmiao1981/spark,wangyum/spark,andrewor14/spark,ddna1021/spark,vinodkc/spark,liyichao/spark,ioana-delaney/spark,rezasafi/spark,icexelloss/spark,zuotingbing/spark,SHASHANKB/spark,ron8hu/spark,narahari92/spark,wangmiao1981/spark,zuotingbing/spark,ericvandenbergfb/spark,narahari92/spark,akopich/spark,holdenk/spark,rekhajoshm/spark,BryanCutler/spark,ddna1021/spark,tengpeng/spark,JoshRosen/spark,dhruve/spark,shaneknapp/spark,mzl9039/spark,brad-kaiser/spark,WeichenXu123/spark,liyichao/spark,kimoonkim/spark,xuanyuanking/spark,lxsmnv/spark,taroplus/spark,cin/spark,skonto/spark,sahilTakiar/spark,ron8hu/spark,loneknightpy/spark,szhem/spark,poffuomo/spark,SnappyDataInc/spark,narahari92/spark,aokolnychyi/spark,xuanyuanking/spark,v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yaphet/spark,hvanhovell/spark,HyukjinKwon/spark,minixalpha/spark,hhbyyh/spark,ericvandenbergfb/spark,lxsmnv/spark,publicRoman/spark,jkbradley/spark,zzcclp/spark,ConeyLiu/spark,akopich/spark,spark-test/spark,cin/spark,dbtsai/spark,wangyum/spark,haowu80s/spark,taroplus/spark,lxsmnv/spark,nchammas/spark,gengliangwang/spark,SnappyDataInc/spark,maropu/spark,MLnick/spark,mahak/spark,mdespriee/spark,kissmetrics/spark,chuckchen/spark,holdenk/spark,wangmiao1981/spark,shubhamchopra/spark,SnappyDataInc/spark,ConeyLiu/spark,ahnqirage/spark,rekhajoshm/spark,jrshust/spark,rednaxelafx/apache-spark,liutang123/spark,cin/spark,huang1900/spark,szhem/spark,guoxiaolongzte/spark,michalsenkyr/spark,adrian-ionescu/apache-spark,byakuinss/spark,apache-spark-on-k8s/spark,debugger87/spark,andrewor14/spark,poffuomo/spark,map222/spark,gengliangwang/spark,witgo/spark